Watlow Series 147 - Manual (Page 3)

4 ■ Watlow Series 147 User’s Manual
Use the following procedure to mount and install the
Watlow Series 147 temperature limit control.
1. Locate and drill four 0.156 in (4 mm) holes in the desired
panel location. See Figure 2 for hole locations.
2. Mount the Series 147 using four #6 screws.
3. Connect the sensor, load, and power as illustrated in the
wiring diagrams on pages 2 and 3.
Figure 4a — Series 147 dimensions.
• Use the correct sensor type per the model number on the
unit sticker.
• Use the proper thermocouple or RTD polarity.
• Insulate the thermocouple mounting from the mounting
surface to prevent heat migration input errors.
• Thermocouple leads should be twisted pair wire and
routed separately from any other lines.
• In electrically noisy environments (heavy switching of
contactor, motors, solenoids, etc.) use shielded thermo-
couple lead wire with the shield connected at the sensor
end only.
• All wiring and fusing must conform to the National
Electric Code (NEC) NFPA70 and any other locally
applicable codes.
• Fuse the independent load voltage on the L1 (hot) side
and connect it to the common (COM) side of the relay.
• Long lead lengths create electrical resistance. When using
a two-wire RTD, there will be an additional input error
for every 1
Ω
of lead length resistance. That resistance
when added to the resistance of the RTD element, can
result in erroneous input to the temperature limit. To
overcome this problem, use a three- wire RTD sensor,
which compensates for lead length resistance. When
extension wire is used for a three-wire RTD, all three
extension wires must have the same electrical resistance
(i.e. same gauge, copper stranded).
Note, caution and warning symbols appear throughout this
book to draw your attention to important operational and
safety information.
A “NOTE” marks a short message to alert you to an
important detail.
A “CAUTION” safety alert appears with information that is
important for protecting your equipment and performance.
A “WARNING” safety alert appears with information that is
important for protecting you, others and equipment from
damage. Pay very close attention to all warnings that apply
to your application.
The ç symbol (an exclamation point in a triangle) precedes
a general CAUTION or WARNING statement.
The Ó symbol (a lightning bolt in a lightning bolt in a
triangle) precedes an electric shock hazard CAUTION or
WARNING safety statement.
120VÅ 147 _ - 1 _ _ _ - 0000
230VÅ 147 _ - 2 _ _ _ - 0000
NOTE: The line voltage is specified by your model number.
Figure 4b — Power wiring.
ç
WARNING: To avoid potential electric shock, use National Electrical Code
safety practices when wiring and connecting this unit to a power source and
to electrical sensors or peripheral devices. Failure to do so could result in
injury and death.
All wiring and fusing must conform to the National Electric Code and to
any locally applicable codes. Failure to comply with these recommendations
could result in damage to equipment and property, and injury to personnel.
ç
CAUTION: The Series 147 temperature limit should be mounted in an incon-
spicuous location to discourage unauthorized changes to the set point. Only
approved and appropriate personnel should have the authority to change the
set point on the limit switch. Failure to comply with these recommendations
could result in damage to equipment and property, and injury to personnel.
ç
CAUTION: Applying incorrect voltage may result in irreversible damage to
the controller.
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50
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250 300
350
400
450
500
L1
Fuse
L2
Recommended fuse size: 1A
100
Power Wiring
Safety Information
Wiring Guidelines
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50
100
150
200
250 300
350
400
450
500
4.500"
4.0 in (102 mm)
4.5 in (114 mm)
3.5 in
(89 mm)
4.0 in
(102 mm)
Dimensions
Installation